sulfur amino acid biosynthetic process serine family amino acid biosynthetic process L-cysteine biosynthetic process https://github.com/geneontology/go-ontology/issues/31281 https://github.com/geneontology/go-ontology/issues/31525 MetaCyc:PWY-7870 cysteine biosynthesis biological_process cysteine anabolism MetaCyc:CYSTSYN-PWY The chemical reactions and pathways resulting in the formation of L-cysteine, 2-amino-3-mercaptopropanoic acid. MetaCyc:HOMOCYSDEGR-PWY GO:0019344 MetaCyc:PWY-8009 cysteine formation MetaCyc:PWY-6308 MetaCyc:PWY-8010 MetaCyc:PWY-7289 cysteine synthesis MetaCyc:PWY-I9 L-amino acid biosynthetic process proteinogenic amino acid biosynthetic process